[El-errata] New Ksplice updates for Oracle Enhanced RHCK 7 (ELBA-2021-3801-1)

[Errata Announcements for Oracle Linux]

Synopsis: ELBA-2021-3801-1 can now be patched using Ksplice
CVEs: CVE-2021-22543 CVE-2021-3653 CVE-2021-3656

Users with Oracle Linux Premier Support can now use Ksplice to patch
against the latest Oracle Linux Bug Fix Advisory, ELBA-2021-3801-1.
More information about this errata can be found at
https://linux.oracle.com/errata/ELBA-2021-3801-1.html

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running Oracle Enhanced
RHCK 7 install these updates.

On systems that have "autoinstall = yes" in /etc/uptrack/uptrack.conf,
these updates will be installed automatically and you do not need to
take any action.

Alternatively, you can install these updates by running:

# /usr/sbin/uptrack-upgrade -y


DESCRIPTION

* CVE-2021-22543: Privilege escalation in KVM due to RO page check bypass.

The reference counts of VM_IO|VM_PFNMAP pages can be manipulated to
cause a deliberate use-after-free. This can be manipulated to cause
writes to arbitrary memory pages, allowing a malicious user with the
ability to create virtual machines to escalate their privileges.


* CVE-2021-3656, CVE-2021-3653: Privilege escalation in the AMD SVM L2 guests handling.

Multiple security bypasses potentially allow L2 guests to read/write host
physical memory.  An untrusted L1 guest running on certain AMD CPUs could
use these flaws to run with full ring zero privileges.

SUPPORT

Ksplice support is available at ksplice-support_ww at oracle.com.